Convert CONFIG_TEGRA_NAND to Kconfig

This converts the following to Kconfig:
   CONFIG_TEGRA_NAND

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index e8528cb..da618ac 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -476,6 +476,14 @@
 	    NFC v800: RK3308, RV1108
 	    NFC v900: PX30, RK3326
 
+config TEGRA_NAND
+	bool "Support for NAND controller on Tegra SoCs"
+	depends on ARCH_TEGRA
+	select SYS_NAND_SELF_INIT
+	imply CMD_NAND
+	help
+	  Enables support for NAND Flash chips on Tegra SoCs platforms.
+
 comment "Generic NAND options"
 
 config SYS_NAND_BLOCK_SIZE